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Titolo:
XMM-Newton detection of a Comptonized accretion disc in the quasar PKS 0558-504
Autore:
OBrien, PT; Reeves, JN; Turner, MJL; Pounds, KA; Page, M; Gliozzi, M; Brinkmann, W; Stephen, JB; Dadina, M;
Indirizzi:
Univ Leicester, XRay Astron Grp, Dept Phys & Astron, Leicester LE1 7RH, Leics, England Univ Leicester Leicester Leics England LE1 7RH er LE1 7RH, Leics, England Univ Coll London, Mullard Space Sci Lab, Dorking RH5 6NT, Surrey, England Univ Coll London Dorking Surrey England RH5 6NT RH5 6NT, Surrey, England Max Planck Inst Extraterr Phys, D-85741 Garching, Germany Max Planck Inst Extraterr Phys Garching Germany D-85741 arching, Germany CNR, Ist Tesre, I-40129 Bologna, Italy CNR Bologna Italy I-40129CNR, Ist Tesre, I-40129 Bologna, Italy
Titolo Testata:
ASTRONOMY AND ASTROPHYSICS
fascicolo: 1, volume: 365, anno: 2001,
pagine: L122 - L127
SICI:
0004-6361(200101)365:1<L122:XDOACA>2.0.ZU;2-O
Fonte:
ISI
Lingua:
ENG
Soggetto:
ACTIVE GALACTIC NUCLEI; X-RAY REFLECTION; BIG BLUE BUMP; COLD MATTER; SPECTRA; GALAXIES; CONSTRAINTS; GINGA;
Keywords:
galaxies : active; X-rays : galaxies; accretion discs; quasars : individual : PKS 0558-504;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
28
Recensione:
Indirizzi per estratti:
Indirizzo: O'Brien, PT Univ Leicester, XRay Astron Grp, Dept Phys & Astron, LeicesterLE1 7RH, Leics, England Univ Leicester Leicester Leics England LE1 7RH Leics, England
Citazione:
P.T. O'Brien et al., "XMM-Newton detection of a Comptonized accretion disc in the quasar PKS 0558-504", ASTRON ASTR, 365(1), 2001, pp. L122-L127

Abstract

We present XMM-Newton observations of the bright quasar PKS 0558-504. The 0.2-10 keV spectrum is dominated by a large, variable soft X-ray excess. The fastest flux variations imply accretion onto a Kerr black hole. The XMM-Newton data suggest the presence of a "big blue bump" in PKS 0558-504 extending from the optical band to similar to3 keV. The soft X-ray spectrum showsno evidence for significant absorption or emission-line features. The mostlikely explanation for the hot big blue bump is Comptonization by the multi-temperature corona of a thermal accretion disc running at a high accretion rate.

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Documento generato il 01/10/20 alle ore 06:53:51